6. Hypertension, defined for adults by SBP ≥ 160 mmHg and/or DBP ≥ 100 mmHg at baseline (or screening if baseline visit is skipped), and for pediatric patients by blood pressure greater than the 95th percentile for age, sex, and height (see Table 16-1). Additionally, patients who were started on antihypertensive medication after HSCT or who have received additional antihypertensive medication after HSCT will be eligible, even if they don't have elevated blood pressure.